* {
    margin: 0;
    padding: 0;
}

html, body {
    width: 100%;
    height: 100%;
    background-color: #dcdde1;
}

.main {
    height: 100%;
    width: 100%;
}

.center {
    position: absolute;
    left: 50%;
    transform: translate(-50%);
}

.layui-card {
    width: 1000px;
    height: 480px;
}


.upDown {
    height: 70px;
    opacity: 0.5;
}

.upDown:hover {
    opacity: 1;
}

.upDown:nth-child(1) {
    position: fixed;
    top: 50%;
    left: 160px;
    transform: translateY(-50%);
    z-index: 1000;
}

.upDown:nth-child(3) {
    position: fixed;
    top: 50%;
    transform: translateY(-50%);
    right: 160px;
}


